Google Bookmarks is a free online bookmarking service, available to Google Account holders.

Pinterest is a web and mobile application startup that operates a software system designed to discover information on the World Wide Web.

SemanticScuttle is a social bookmarking tool experimenting with features like structured tags and collaborative tag descriptions.

Tizmos for Teachers is a personalized page for teachers that allows them to easily share online resources with students and other teachers.

inboard (Pinboard.in) is a social bookmarking website.

Raindrop.io syncs bookmarks into the cloud and makes them beautiful as well as easy to search.

Skloog is an online bookmark management website that is used to organize and sort bookmarks.

Tumblr is a microblogging and social networking website.